Pin tumbler cylinder and key system



June 22, 1965 E. L. scHLAGE 3,190,093

PIN TUMBLERQCYLINDER AND KEY SYSTEM Filed Feb. 7, 196s 4 sheets-sheet 1 INVENTOR ifvisr L, .6b/nai WM). @kf

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irraiA/i/ June 22, 1965 E. L. scHLAGE 3,190,093

PIN TUMBLER CYLINDER AND KEY SYSTEM Filed Feb. 7, 1963 4 Sheets-Sheet 2 FIG Lk.. a@

INVENTOR. gi/V557' L Jef/446i BY ,/f rraiA/if FIG-8 June 22, 1965 E. L. scHLAGE 3,190,093

Y PIN TUMBLER-CYLINDER AND KEY SYSTEM Filed Feb. 7, 196s 4 slums-sheet :s

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`lune 22, 1965 E. L. SCHLAGE PIN TUMBLER ACYLINDER AND KEY SYSTEM 4 Sheets-Sheet 4 Filed Feb. '7, 1963 Fla l6 INVENTOR. ien/57' 4, .5c/wai BY ,Zzfr/ r @Aff United StatesyPatent O 3,190,093 PIN TUMBLER CYLINDER AND KEY SYSTEM Ernest L. Schlage, Burlingame, Calif., assigner to Schlage Lock Company, a corporationv Filed Feb. 7, 1963, Ser. No. 256,852 11 Claims. (Cl. 'M -383) My invention relates to a pin tumbler cylinder unit and key mechanism in which the unit can be put in unlocked condition by any one of a series of different keys, but the use of a key later in the series makes the unit unresponsive thereafter .to keys earlier in the series. Stated more particularly, the invention contemplates a cylinder unit which may be repeatedly put in unlocked condition by a primary (temporary) key until such time as the unit has once been put in unlocked condition by a secondary (permanent) key. Thereafter the unit may be repeatedly put in unlocked condition by the secondary key until it is once put in unlocked condition by a tertiary key, and so on.

My invention also relates to a pin tumbler cylinder unit in which a primary key is effective, but a secondary key is ineiective, until a trigger key is used. Thereafter the primary key is ineffective but the secondary key is eiective.

There are many instances in which a lock unit can with advantage-be temporarily keyed to one key and can then be altered so that the temporary key is no longer of avail, but a subsequent permanent key is freely usable. For example, when a building is being built or has recently been completed, -it is often desirable to close all or portions of the building for reasonable security, but also to supply one or more people with keys aording ready access. It is desired, however, that eventually the building will be made accessible lonly to a different group of people and the original group will at that time be permanently excluded. To avoid the expense and labor of installing and subsequently removing temporary lock units and then nally installingv an entirely dierent set of permanent lock units, there is provided a Way pursuant to the invention to install the permanent lock units originally. Temporary keys are issuedV to the requisite people. To guard against a failure to retrieve all of such keys, there is provided a means for conditioning thelock units automatically to exclude the initial temporary keys and thereafter to afford access only by means of dilerent permanent keys.

Under some circumstances it may be desirable to have more than simply temporaryand permanent keys and to have a Whole series of keys, each group of keys in one stage of the series being useful during a particular time period and each key in the series being effective to exclude keys earlier in the series. Under other circumstances it may be desirable to make use of an intermediate or trigger key to condition the lock units to render the temporary keys thereafter ineffective and to render the theretofore ineffective permanent keys etective thereafter.

It is therefore an object of the invention to provide a pin tumbler cylinder and key system that can be permanently installed and which can be initially worked by temporary keys, but which after once being worked by permanent keys will no longer respond to the temporaryl keys.

Another object of the invention is to provide a :lock unit 3,190,093 Patented June 22, 1965 in which a key itself will be effective to exclude prior keys in the series.

`Another object of the invention is to provide a pin tumbler cylinder and key system in which the alteration of the lock unit, having once been effected by a later key in the series, is irreversible Withou-t completely disassembling the lock unit.

Another object of the invention is to provide a pin tumbler cylinder and key system which at different times is responsive to different keys in a series. Y

A still further object of the invention is to provide a pin tumbler cylinder and key system having especially responsive tumblers.

Another object of the invention is to provide an improved pin tumbler cylinder and key system.

Another object of the invention is to provide a pin tumbler cylinder and key system in which a trigger key is effective to render a lock unit previously responsive to a primary key and not to a secondary key thereafter responsive to the secondary key and not to the primary key.

Other objects of the invention together with the foregoing are attained in the forms of the invention described in the accompanying description and illustrated in the accompanying drawings, in which:

FIGURE 1 is an isometric View of a pin tumbler cylinder and key lock system, portions of the mechanism being bnoken away to disclose the interior construction, and the remaining parts of the lock unit being omitted;

FIGURE r2. is a side elevation of a primary or temporary key for use with the structure of FIGURE l;

FIGURE 3 is a side elevation of a secondary or permanent key in the series useful with the structure of FIG- URE l;

FIGURE 4 is a cross section, the plane of which is indicated by the lines 4--4 of FIGURE l, showing the interior construction with the parts in position with a primary or temporary key; Y

FIGURE 5 is a view similar to FIGURE 4, `but showing the parts in position upon the rst insertion of a secondary or permanent key;

FIGURE 6 is a viewof the mechanism of FIGURE 5, but rotated for actuation; l

FIGURE 7` is a View similar to FIGURE 6 but showing the parts in their FIGURE 5 position, but with the later insertion of a primary or temporary key;

FIGURE 8 is a side elevation of a different form of prim ary or temporary key;

" FIGURE 9 is a side elevation of a diierent form of a secondary orpermanent key;

FIGURE l0 is an elevation of a telescopic pin tumbler, portions being broken away; Y

FIGURE l1 is a side elevation of a modified form of telescopic pin tumbler, a portion being illustrated in transverse cross section; v

FIGURE 12 is a view of a still further modified form of pin tumbler arrangement, portions being illustrated in cross section; ,v Y

FIGURE 13 is a view of a pin tumbler assembly with portions of this further modified form being shown in cross section; l

FIGURE 1,4 is an enlarged View of the cylinder portion of a lock unit in cross section showing a still further modied form of pin tumbler arrangement with a primary or temporary key in position;

o e Y Y o FIGURE l is a schematic view of a lock unit in condition for use of a temporary key; Y s

FIGURE 16 is a schematicrview of .the lock unit of FIGURE injcondition in which` a permanent key is Y ineffective;

FIGURE 17 is a schematic view otra lock unit as conditioned by a trigger key; .Y Y

FIGURE 18 is a schematic viewvof the lock V'unit in Y f condition for use of a permanent key;-

Y FIGURE 19 is a schematic view of the lock unitrin condition in which the temporary key is ineffective; and

VFIGURE 2O is aside elevation of a keyfshowingthe contour for temporary, trigger and permanent operation.`

The invention disclosed herein is related to that'disf closed in mycopending applications Serial VNo. V82,774 filed January 16, 1961, and Serial'No. 84,378 filed January23, 19,61. Y Y Y While the pin tumbler cylinder and key system of the inventionV can be embodied in a number of different days,

it is typically embodied forY use in acustomary form ofY cylindricallock unit. As partof the lock unit, a body 6, of metal, is designed to be mounted in the remainder of the lock structure Y(not shown). The body 6 is approximately symmetrical about a central, vertical plane passing through an axis 7 of symmetry. A'rotor'V bore 8 y extends entirely through the body 6.Y A projecting iin 9 is integral with the remainder` of the circular cylindrical body. There is at least one tumbler bore 11 in the 1in 9.

The usual body has a plurality of tumbler bores therein: Y

but the numberl can range fromja single one up to, say, tive or seven. Each of the tumber bores 11, 11a, 11b, 11C and 11d is like the others and is disposed on a related one of a number of cross axes 12, 12a, 12b, 12C Vand 12d perpendicular to the axis 7. Each of the Various tumbler bores intersectsthe rotor bore 8 to provide ashoulder 13 (FIGURE 4)V at their intersection.Y

Mounted within the rotor bore 8 is a rotor 14 preferably of metal ,having a generally circular Vcylindrical exterior contour tting the body 6 snugly' but with freedom of rotation of the rotor 14 about the axis 7. Atoneend the rotorY is enlarged'into a diskflike Hang@ .716. At the other end the rotorris threaded or otherwise contoured '.to receive an applied cap17 from which a shaft 18 pro- Y' jects. The shaft 18 rotates together withthefrotorV 14 and is the member actuating the lock bolt (notrshown). The rotor 14 is'machined, usually byfbroaching, to prokey channel configuration or cross section is substantially uniform throughout the length of the rotor and'in the usual case lies on both sides of the axis 7.]

Y Also formed in the rotor and preferably in locations so that in at least one rotated position of theY rotorY they serve as continuations'of the tumbler `bores are one or 'Y morey pin bores 22. As with the tumbler' bores, there are customarily from liveto lseven of these such as 22a, 22b, 22g: and 22d, each being substantially `like the others.

The pin bores extend far enough into theY rotor in a radial direction` to make intersections with the key 'channel` at least to the maximum'distance for tumblertravel. Y n

Designed to be received in the key channel 21 are keys of two or more series. These all have a vcormnon cross sectional contour which will fit readily within the channel Y 21 nand they all have key `contigurations for propercomvide a key channel 21 of any desired cross sectiongV TheV Y body` have an over-all length, when Vthe telescopic pin' tumblerris seated on aninserted primary or temporaryY s 4 of several transverse center 32e and 32d perpendicular to the axis 29.

A key belonging tothe next or Ylater series is called a secondary or permanent key and is shown in FIGURE 3f This key 33 extends along an axis 34I and is provided with a key bow 36 comparable to the key bow 27; The shank e 37 of the key'33 has a similarrcross section to that of theV key 26 and to casual observationis lvirtually identical with the primary key. Serrations'on the key 33V are arranged to be symmetrical aboutperpendicular center lines 3 8, 38a, 3817,V 38C and 38d spaced and. disposed in the same fashion as the-various axes 32, 32a, 32h, 320iY and 32d.V The salient distinctiongbetween the primary and secondary keys is that on oneof'pthe primary key center lines, such as'32b,for example, Vthe serration is consti-` tted by a notch 41 having `considerably greater Vdepth or terminating closer to Ythe lower edge`42 of the key than does` the serration 43 of the secondary*` key 33 V*on ther cylindrical construction slidable ,in the tumbler Y and pin bores,V those in the lowermost locationsV terminating in rounded or conical'lowe'rrends 51. All of the various tumblersvare spring-pressed*towarclvthe axis 7 by springs 52 located within the tumbler bores. The ,tumblers follow and Vaccommodate the serrations of an inserted key to provide shear planes betweenA successive tumbler pins substantially 'coincident with the parting surfaces between the body 6 and the rotor 8.

Pursuant tothe invention, in'one of the pin bores,- at

least, there is provided `a special telescopic pin tumbler V56. As particularly shown in FIGURE 4, the telescopicV pin tumbler comprises alowe'r body 57 having a rounded lower'end 58, the diameter of the body being such'that the body translates freely within the pinbore along the respective axis 12b, forexample. The length of the body,

is substantially less than'would normally be the case.-

' The short body is provided with an internal cylindrical cavityV 59 leaving a relatively thin annular sleeve 61'.,

A portion of a ball 62Yisarranged Vinjuxtaposition with f the' sleeve. The diameter'ofY the ball'is such that it'isi. Y very slightly, greater than the diameter kof the sleeve cavityy 59. The ball normally is lightly seated in the end of the` sleeve withk sut`n`cient frictional interferenceVY so thatlthe partswill stay together during handling and initial use.'`

In" this Vlightly seated, extended condition, the .balliand key 26, such that the upper periphery of the ball is sub.- stantially at a distance D from the-axis 7 equivalentlto theradius D of the rotor.. Consequently, when the `tem-` porary keyfis inserted and the rotoristo berrotated in the body 6, thererare proper'shear surfaces between theball binations. Each series may have many keys.V Usually,

thernumber of series is limited .to the number of'p'in bores or tumbler bores. For example, if there aretve pin bores, Ythen there maybe ve series of keys. It is consideredV Vat presehtthat two keysiconstitutes the minimum series.

Y- A key` belonging to thegiirs't' seriesrisfoneV rSL tofbe used withthe remainder of the mechanism point of time. VThis-key. '26, asshown inFIGURE 2istevrmed Y aY primary or temporary key andY includes a Akey bow 27-4 and also akeyshank 2S. The key extends along an axis e* 29 'and has certainV serrationsalong the ;upperedge 31.

Each serration' has especial reference toa respectiveone Y.

62 ,and Vthe superposed pin within the bore 11b and the rotation can readily ensue. When the'temporary key'r26 is withclrawrnl the spring 52 iseective upon the pin and Vall of the parts arevrestored to normal ,non-rotatable i condition. The primary, temporary key 26, having a rela-V tively low serration or notch 41, can be repeatedlyrused y in this way. During such'use, .the .intert of the ball 62 and of the'sleevel is unchanged and the over-all length? Vof the ball and body 57 Vremains the same. The spring V52 isnot strong enough to overcome the irictional inter--Y engagemeutof the telescopic parts.'` e f Y When the secondary or permanent keyin the series 1 .is introduced into the key channel'as particularly s hown in FIGURE 5, Ythen'the'serr'ation 43, which is relatively ,p Vh'iglnocupies a position immediately under the telescopic Y pin tumbler'in the'location 1lb. The partis, not having -3 lines such as 32, 32a, B2b,4

a key in the rotor 8 most of the A changed over-all length, then are in the relationship shown in FIGURE 5 with the periphery of theY ball 62 at a distance E, greater than D, from the rotational axis. The meeting sur-faces of the ball and the superposed tumbler are not in any shear plane of the body and rotor. The dimensions are such that when the rotor is subsequently rotated, the surface of the ball 62 abuts and cams against the shoulder 13, which may be somewhat rounded. Thev interengagement between the ball and the shoulder is not a blocking contact, but rather is an inclined camming.`

As the rotor continues to turn clockwise,'in FIGURE 5, the camming between the ball and the shoulder drives the ball farther into the cavity 59 and slightly expands the annular sleeve 61 so that a tight, frictional, permanent interengagement is provided between the ball and the sleeve wall. The expansion of the sleeve is not enough to impair its sliding motion in the rotor. When the rotor has been turned past the shoulder 13, the ball has been driven far enough into the sleeve so that the overeall dimension of the body 57 and ball 62 (or of the telescopic pin tumbler) is a new Shorter value, the top of the ball now being at distance D from the rotational axis rather than the distance E therefrom. This is shown in FIG- URE 6. When the rotor subsequently is rotated to its initial position and the key is withdrawn, the parts are restored to their normal non-rotating positions by the spring 52. Subsequent insertions of the secondary key 33 produce a similar actuation of the rotor without difculty.

When, as shown in FIGURE 7, the primary or temporary key 26 is subsequently introduced, the length of the telescopic pin tumbler having been shortened, the key 26 is then sufficient only to lift the top of the ballto a radius or level F less than the `radius or level D.` This is not suicient to lift the ball 62 up to the shear plane between the rotor and the body and the rotor cannot be actuated. Thus, the first insertion of the secondary key followed by rotation of the rotor permanently telescopes the telescopic pin tumbler to prevent operation by a key of the earlier series.

Usually this arrangement is sufficiently effective by the use of a telescopic pin tumbler in only oneY position. However, more than one telescopic pin tumbler can be uti.V lized. They can be disposed in various positions. The keys in the later series, progressively having high serrations instead of the low serrations in the keys of the earlier series, afford successive exclusions.

It is not always necessary to provide an arrangement in which the telescopic pin tumbler is telescoped by rotation of the rotor with the key in place. A telescopic tumbler can be put in the innermost bore 11, for example. With this is used a primary key 69 of the sort shown in FIG- URE 8. In this the first serration or notch 71 is relatively low or close to the lower edge of the key as the key moves along an axis 72. In the secondary or permanent key 74, shown in FIGURE 9, the serration 76 in the first order is relatively high or far from the lower edge. The contour of the end key surface 77 is a continuous cam extending to an extra hump 75 farther from the lower edge than the serration 76. The primary key is entirely inserted in the key channel and properly positions the extended telescopic pin tumbler for rotor turning. When the secondary key is introduced into the key channel and is axially moved almost completely home, then the cam surface 77 lifts the telescopic pin tumbler over the hump 75. During the lifting movement the spring 78 is compressed to a resistance greater than the resistance of the'pin tumbler to telescoping. The over-all tumbler length is thus shortened so that when the serration 76 is in place, a proper shear plane is established and the rotor can be turned. After the mere insertion of the secondary key, when the primary key is again inserted, it is found that the telescopic pin tumbler, having been permanently shortened does not rise to proper position in the shear plane for rotor rotation. The initial key has been rendered inoperative.

There are many ways of providing a suitable telescopic pin tumbler. As shown particularly in FIGURE 10, the lower body 81 is as previously described, having an internal cylindrical cavity 82 to leave a sleeve with an annular wall 83. The body has an inclined or cammed lower terminus 84. Instead of a ball, one of the telescoping members is a pin 86 having a hemispherical upper end 87 and having a cylindrical stem 88 having a predetermined amount of intersurface friction with the wall 83. The operation of the parts is as previously described, but there are larger surfaces for frictional interengagement.

As shown in FIGURE 1l, the pin ends can be substantially uniformin diameter. The lower body 91 has a reduced projection 92 over which a cap 93 fits with predetermined frictional interengagement. The cap has a rounded upper end 94 and an internal cylindrical cavity 96 receiving the projection 92.

It is not necessary that the pin which comes into immediate contact with the key be telescoping. As shown in FIGURE 12, a regular form of lower tumbler pin 101 having a conical terminus 102 to intereugage with a key can be provided. The pin 101 has a slightly bevelled upper end 103 to accommodate a cup-like pin 104 having an internal cylindrical cavity 106. Extending into the cavity is a telescoping piece 108 with a rounded upper end 109. The intersurface frictional fit and the operation of Vthis construction `are substantially as before.

In the variation shown in FIGURE 13, the substantially standard lower pin 111 has a cup-like adjacent pin 112. A relatively small lower shank 113 which frictionally engages the interior wall of the cup 114 is provided with a mushroom head 116.

As shown in FIGURE 14, itis feasible to invert the telescoping pin tumbler. A ball 121 rests directly upon the inserted primary key and is in light frictional engagement with the interior cavity wall of an inverted cup 122 of a telescopic tumbler pin 123. The pin 123 has a bevelled upper end 124. When a secondary key is inserted and lifts the pin 123 and when the Arotor 127 is turned, the upper end 124 cams against a shoulder A126. The ball 121 is thus forced into the cup 122 and reduces the over-all dimension of the pin tumbler.

The telescopic pin tumbler has another use. In the assembly of pin tumbler lock units, a key is put into the rotor and the tumblers are assembled therewith. This is usually donc in the factory in an assembly jig or dummy setup. If by chance any of the usual, solid tumblers project above the shear plane of the rotor, they can be hand filed to the precise dimension of the shear plane for free operation. By utilizing telescopic tumblers, it is not necessary to tile down any projections. It is merely necessary to turn the key and the rotor in the fixture or dummy. Upon the irst rotation the projecting telescopic tumblers are automatically cammed and slightly shortened to theV proper dimension.

Itis sometimes desired to have a primary key effective exclusively of a secondary key and then to have'the secondary key effective exclusively of the primary key. This is accomplished with a telescopic Vpin tumbler in connection with a special key, usually called a trigger key.

The relationship of the keys is such that they are all substantially the same except that in at least oneposition, the serrations of the keys have a particular relationship. As shown in FIGURE 20, all of the keys have a bow 131 and a shank 132 and appropriate serrations 133, but the' trigger key has a high or shallow notch 134 higher than any other serrations between it and the end of the key. The primary or temporary key has an intermediate notch 136 and the secondary or permanent key has a low or deep notch 137. The notch depths are measured from the lower edge 138 of the key shank 132.

The keys are used with a rotor 141 turnable Vin a body 142. The rotor carries a telescping pin tumbler 143 cooperatively arranged with a lower pin 144 and an upper pin 146 pressed away from a shoulder by a spring 147."

When the temporary or primary key is inserted, as shown in FIGURE 15, the notch V136 establishes the position of 144 and the rotor 141 can be turned. If thesecondary or permanent key is used, the notch,137,"as shown in FIGURE ,16,7 disposes the extended pin tumbler Y143 and the lowerk pin 144 so that the rotor cannot beturned. v

Vthe extended telescopic pin'tumbler 143 so that thereare a f shear surfaces between the 'tumbler 143 and the lower pin When it is desired to make the permanent key operative, f

the trigger key is introduced and because of its high notch V134, as seen in FIGURE 17, is effective as it is positioned to telescope or shorten the pin tumbler 1.43. The trigger key itself'is always eiective toturn the rotor Yldlafter the tumbler 143 has been shortened. Therearftenwhen the secondary key is utilized, as shown in FIGURE 18,

bore intersecting said cylinder bore,'a rotor mounted to rotate Within said cylinderbore, said rotor having a key channel therein and having a pin borre intersecting `said key channel Vand disposed in alignment withsaid tumbler borre in one rotated position of said rotor,` a variable i Y lengthpin tumbler disposed in'said pin bore and mov-` i 'ablebetween a long'positiongand a s hort position, said j pin tumblerwhen abutting ai key in said channel and ink said long position extendingrinto said tumblerk bore, and

means on said body engageable by one'end ofV said pin j tumblerV upon rotation of said rotor for moving said pin Ytumbler from long. position to short` position when said the notch 137 so positions the short pin tumbler 143 as to n Y put the shear surfaces between the lower pin 144 and the upper pin 146 in place for rotor turningf Y y Thereafter, when the primary key is tried, the upper surface of the notch 1.36 positions the shortened `pin tumbler Y 143 and the lower pin 144pin suchaV fashionthat the variousrshea'r surfaces are not in location for the'rotor Yto be turned. Y

What is claimed is:

1. A pin tumbler cylinder and key system comprising bore intersecting said cylinder bore, a spring 'in said tumbler bore, a tumbler'in said tumbler bore against said spring, a rotor in said cylinder `bore and rotatable therein relative to said body, said rotor having a pin bore Ytherein in one position of said rotor adapted to yalign with said tumbler bore, means forming a channel n channel therein and having a pin bore intersecting said ,Y key channel and disposed in alignment with said'tumbler 25 abody with a cylinder bore thereinY and having a tumblerY bore in oneY rotated position of said rotor, aavariable length pin tumbler Vdisposed in said pin bore andrm'ovable between a long position and a short position,"`said pin tumbler when abutting a key in said channel and in said long position extending into said tumbler bore, and` means forming interengaging surfaces on said `body and on said pinrturnbler forcamming said tumblerpin from V long position `to short position when said rotor is r0- able from locked condition to Yunlocked condition when` in said rotor for receiving a key, said channel intersect- Y ing said Vpin bore, a variable length tumbler pin inV said pin boreY and having one end adapted to lie entirely Within said pin bore when a temporary key is in said channel against the other end of said tumblerlpin and adapted to .extend into said tumbler bore when a permanent key is in said channel against said other end of said tumbler pin, and means for shortening said variable length tumbler pin Yby camming said one end against said .body upon Vthe initial'rotation of said rotorwith said permanent key in said channel.

V2. A pin tumbler cylinderV and key system comprising a body having a cylindrical bore therein, one portion of said bore beingvradiallynenlarged to provide an inclined cam surface, a rotor rotatable in said bore and having a radial pin bore therein, a variable length pin tumbler inV `tated by said key in said channel. y e

7. A pin tumbler cylinder andkey system comprising a body, a key-.receiving rotor in said body, means in said body and rotor forming a pin tumbler combination mova` primary key with a low notch is in said rotor, means including a variable length pin tumbler in said combination for changing said combination to move from locked condition to unlocked condition only when `a secondary key with a highnotch is in said rotor, said changing rotor for changing the lengthrof'said variable length pin tumbler. n Y

.Y 8. Aipin tumbler cylinder and key system comprising 1 a kbody having a cylinder bore therein and having a tumbler bore intersecting said cylinder bore substantially normal to the axis of said cylinder bore and providing a shoulder at the intersection of said cylinder bore `and tumbler bore, a rotor in said cylinder bore and rotatable therein relative to said body, said rotor havingV a key channel extending axially therein and having a pin bore saidfpin bore, means forgholding Aone portion of said pin tumbler in position in said rotor while another portion of said `pin tumbler is extended to be disposed 'against said cam surface, and means for rotating said rotor in Y said body and said other portionnof'saidY pin tumbler kagainst said cam surface to force said pin tumbler from extended position to retracted position. a

3. A pin`tumbler cylinder and key system comprising a body having a cylindrical bore therein, one portion of *f said bore having an enlargement to provide a shoulder, a rotor disposed in said bore and rotatable relative to said body, means in said rotor for' receiving a pin` tumbler, a pin tumbler disposed in said receiving means and havf` ing an end movable from a long position extendingu into said enlargementV to a shortY position within said'bore, Y means for vrotating said rotor in said body and thereby I Y' moving said end and said shoulder y.into contact, and

Vmeans formingcamming: surfaces on said pin tumbler and on said shoulder elective .to move said'end from long position'v to short position during rotation of said rotor in said bodywith' saidjcamming surfaces incontact.

body having Aa cylinder bore thereinand having a tumbler 4.',A pin tumblercylinderand key system as in claim; Sin which said'y meansY for rotating Vsaid rotor is a key? Yinrengagernent'with said Vrotor'and said pin tumbler. n 5. A pin tumbler cylinder and keysystem comprising a intersecting said key channel substantially'normal toatheY axis of said rotor, aY variable length pin tumbler adapted to be disposed in said pin bore and having one end abutting against a key'in said key channel, said pin tumbler'` having another end `adapted in one position tof extend into said tumbler bore, andan inclinedlsurface on saidV -x other end of said pin tumbler adapted to Vengage said shoulderrwhen said rotorgis'partially turned by said key andato move'said` other end'of said Vpin tumbler out Vof said tumbler boreand into said pin bore when said rotor is additionally turned by said key; ,Y

9. Ina pin tumbler cylind'erlock, a body, a rotor rotatable in saidV body, means in ,said rotor* for ,receiving a pin tumbler, atwopart telescopin'g'pin tumblerdisposed inj 3 and having one of Vsaid partsrprojecting from said receiving means, and means actuated bya key engaging the'otl'le'r, of Y said parts of said pin tumbler androtating said rotor in said Y b ody for forcing said one Ypart ofsaidpin tumbler against` n said body and telescoping said V:two parts of Ysaidy pin f' tumbler: v Y

10. A 'pin tumbler cylinder and key systemcomprising a body Yhaving a cylinder bore thereima rotor having a cylindrical surfacein said'cylinder Ybore andV rotatable relative Vto said body, means formingVV a pin bore in said` l rotor, means forming a key channel'in said-rotor Yinter-V Y secting said pin bore, a. yariable length pin tumblerrin said pin bore, one endv of said pin tumbler being flush with said surface of said rotor when the other end of said pin tumbler abuts a temporary key in said key channel and said one end of said pin tumbler projecting from said rotor when the other end of said Vpin tumbler abuts a permanent key in said key channel, means forming a camming surface on said one end of said pin tumbler, and a shoulder on said body in the rotational path of said projecting cam surface and adapted to force said one end of said pin tumbler ush with said surface of said rotor when said rotor is rotated in said body with said shoulder in engagement Withsaid projecting cam surface.

l@ 11. A device as in claim 10 in which said pin tumbler has relatively slidable parts actuated by movement of said camming surface over said shoulder.

References Cited bythe Examiner UNITED STATES PATENTS ALBERT H. KAMPE, PrimaryV Examiner. 

9. IN A PIN TUMBLER CYLINDER LOCK, A BODY, A ROTOR ROTATABLE IN SAID BODY, MEANS IN SAID ROTOR FOR RECEIVING A PIN TUMBLER, A TWO PART TELESCOPING PIN TUMBLER DISPOSED IN AND HAVING ONE OF SAID PARTS PROJECTING FROM SAID RECEIVING MEANS, AND MEANS ACTUATED BY A KEY ENGAGING THE OTHER OF SAID PARTS OF SAID PIN TUMBLER AND ROTATING SAID ROTOR IN SAID BODY FOR FORCING SAID ONE PART OF SAID PIN TUMBLER AGAINST SAID BODY AND TELESCOPING SAID TWO PARTS OF SAID PIN TUMBLER. 